The application does not show brainwaves even though it looks connected?

When first putting on the headset, use your fingers to gently press the metal ear contacts against the skin of your earlobe for several seconds. This added little bit of initial pressure often significantly helps the ear contacts a surprising amount, which in turn significantly helps the forehead sensor take clean, good quality readings of your brainwaves. Also, before connecting the earclip, it may help to rub your earlobe with your fingers a little bit to warm up your ear.

Make sure all the metal sensor contacts are clean (forehead and ear clip). If necessary, use alcohol wipes to gently clean the sensors.

Make sure your ears and forehead are clean. For example, ensure that you remove makeup or wash your face from sweat. Also, it may be helpful to remove earrings.

Make sure all the contacts are making firm contact with the skin of your forehead and ear. Make sure there is no hair nor jewelry getting in the way between the metal contact surfaces and your skin.